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    ASTM B250 / B250M - 19

    Standard Specification for General Requirements for Wrought Copper Alloy Wire

    Active Standard ASTM B250 / B250M | Developed by Subcommittee: B05.02

    Book of Standards Volume: 02.01

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    This specification establishes the general requirements common to wrought copper and copper alloy wires. The materials for manufacture shall be a cast bar, billet, rod, or other form of such purity and soundness as to be suitable for processing by hot working, cold working, and subsequent annealing to produce finished products that meet the specified temper properties and have a uniform wrought structure. Products shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (diameter, thickness, specific and stock lengths, width, straightness, and edge contour), mechanical (tensile, yield and bend strengths, elongation, and Rockwell hardness), electrical (resistivity and conductivity), chemical composition, and grain size requirements. In the event of conflict between this specification and the individual casting product specifications, the requirements of the casting specification shall take precedence.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    12.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.


    Rounded Unit for Observed
    or Calculated Value



      Chemical composition
      Electrical resistivity/conductivity

      nearest unit in the last
       right-hand significant
       digit used in expressing
       the limiting value


      Tensile strength
      Yield strength

      nearest ksi [5 MPa]




       Below 5 %

      nearest multiple of 0.5 %

       5 % and over

      nearest 1 %


      Grain size


       Under 0.060 mm

      nearest multiple of 0.005 mm

       0.060 mm and over

      nearest 0.01 mm

    1. Scope

    1.1 This specification establishes requirements common to wrought copper and copper alloy wire and shall apply to Specifications B16/B16M, B99/B99M, B134/B134M, B159/B159M, B197/B197M, B206/B206M, B272, B301/B301M, B453/B453M, B967/B967M, B974/B974M, and B981/B981M to the extent referenced therein.

    1.2 The chemical composition, physical and mechanical properties, and all other requirements not included in this specification shall be prescribed in the product specification.

    1.3 Units—Values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other and values from the two systems shall not be combined.

    1.4 The following safety hazard caveat pertains only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B16/B16M Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines

    B99/B99M Specification for Copper-Silicon Alloy Wire for General Applications

    B134/B134M Specification for Brass Wire

    B159/B159M Specification for Phosphor Bronze Wire

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B194 Specification for Copper-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar

    B197/B197M Specification for Copper-Beryllium Alloy Wire

    B206/B206M Specification for Copper-Nickel-Zinc (Nickel Silver) Wire and Copper-Nickel Alloy Wire

    B272 Specification for Copper Flat Products with Finished (Rolled or Drawn) Edges (Flat Wire and Strip)

    B301/B301M Specification for Free-Cutting Copper Rod, Bar, Wire, and Shapes

    B453/B453M Specification for Copper-Zinc-Lead Alloy (Leaded-Brass) Rod, Bar, and Shapes

    B846 Terminology for Copper and Copper Alloys

    B900 Practice for Packaging of Copper and Copper Alloy Mill Products for U.S. Government Agencies

    B967/B967M Specification for Copper-Zinc-Tin-Bismuth Alloy Rod, Bar and Wire

    B974/B974M Specification for Free-Cutting Bismuth Brass Rod, Bar and Wire

    B981/B981M Specification for Low-Leaded Brass Rod, Bar, Wire, and Shapes

    E3 Guide for Preparation of Metallographic Specimens

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E54 Test Methods for Chemical Analysis of Special Brasses and Bronzes

    E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods)

    E75 Test Methods for Chemical Analysis of Copper-Nickel and Copper-Nickel-Zinc Alloys

    E112 Test Methods for Determining Average Grain Size

    E118 Test Methods for Chemical Analysis of Copper-Chromium Alloys

    E121 Test Methods for Chemical Analysis of Copper-Tellurium Alloys

    E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition

    E478 Test Methods for Chemical Analysis of Copper Alloys

    E581 Test Methods for Chemical Analysis of Manganese-Copper Alloys

    ICS Code

    ICS Number Code 77.150.30 (Copper products)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0250_B0250M-19

    Citation Format

    ASTM B250 / B250M-19, Standard Specification for General Requirements for Wrought Copper Alloy Wire, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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